我如何使用正则表达式在两个字符内获取一个字符串并删除该字符串内的某些字符答案

【问题标题】：how do i use regex to get a string inside two character and remove certain characters inside that string我如何使用正则表达式在两个字符内获取一个字符串并删除该字符串内的某些字符
【发布时间】：2020-12-25 23:00:32
【问题描述】：

我想使用正则表达式过滤一个长字符串

<@961483653468439706> Text to remove, this text is useless, that's why i want it gone!
i want this: `keep the letters and spaces`

我想保留`字符之间的文本

唯一的问题是在我想要的字符串部分的每个字符之间都有一个不可见的字符。你可以看到regex101中的不可见字符：https://regex101.com/r/rAYrMT/1

`([\'^\w]*)`

简而言之：保留 ` 之间的所有内容，除了可以在此处找到的不可见字符信息：https://apps.timwhitlock.info/unicode/inspect?s=%EF%BB%BF

【问题讨论】：

你有什么办法解决这个问题？
字符串是如何获取的？听起来好像被错误解码了，在这种情况下正确解码可能会解决问题。

标签： python python-3.x regex python-re

【解决方案1】：

您可以过滤掉不可打印的字符：

import re 
from string import printable

# your invisibles are in the string...

s='''<@961483653468439706> Text to remove, this text is useless, that's why i want it gone!
Type `keep the letters and spaces` and `this too`'''

for m in re.findall(r'`([^`]*)`', s):
    print(repr(m))
    print(''.join([c for c in m if c in printable]))
    print()

打印：

'k\ufeffe\ufeffe\ufeffp\ufeff \ufefft\ufeffh\ufeffe\ufeff \ufeffl\ufeffe\ufefft\ufefft\ufeffe\ufeffr\ufeffs a\ufeffn\ufeffd s\ufeffp\ufeffa\ufeffc\ufeffe\ufeffs'
keep the letters and spaces

'this too'
this too

【讨论】：

【解决方案2】：

您不需要为此使用正则表达式：

text = "<@961483653468439706> Text to remove, this text is useless, that's " \
       "why i want it gone!Type `keep the letters and spaces`"

# put your invisible character between the first quotation marks here. obviously, they
# don't show up in this post.
filtered = text.replace('', '')
# because the passage you want is always between ``, you can split it and know that every
# second item in the list that split returns must be what you are looking for. 
passage = filtered.split('`')[::2]

print(passage)

【讨论】：